Malicious PDF — malware analysis report

Static analysis result for SHA-256 5db66e4329758462…

MALICIOUS

PDF

76.1 KB Created: 2021-09-09 18:07:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8d84181e469d929fed271d7a90db25d8 SHA-1: 2cea0821f8f045f32760e3f023636326872158bc SHA-256: 5db66e4329758462ed6bda3ba223e5ed22cf21e8edfa4fac43c8be0be7b4b1b8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, a common tactic for phishing and malware distribution. ClamAV detection and ML classification strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it is designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://sskj.pl/userfiles/file/7933800964.pdf In PDF document text
    • http://robedecreateur.com/img/files/23053745641.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323d8f67a3c---punetuzulevuleroralikuza.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/nifoxaboziriwudezafu.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/vusoxipawuzexezokemolilu.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/jutelitufizaxejoz.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/zomomenomevi.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/sexuzaw.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/tinibopesozavolun.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/76301401302.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210901152000.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/reror.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/redotub.pdfIn PDF document text
    • http://ilink.pl/userfiles/file/faserezawunitadafusa.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/95716300892.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/71000642821.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613922f3d987b---89998076013.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/nemixikoza.pdfIn PDF document text
    • http://sivam.pl/files/file/nazivaxekofomenebupofot.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/dosetopotapenexukurejew.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/66839786488.pdfIn PDF document text
    • http://orthodoxnews.us/file/82307391243.pdfIn PDF document text
    • http://gachmenminhchien.com/media/ftp/file/xemulamavamurene.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/965635231201630720157.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=winx+hd+video+converter+deluxe+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DA 10648 bytes
SHA-256: 8a04acc2adf5c1b52e76681ff5e64c3307d3144266126077de729ba5ecbae1cb
font_01_sfnt_off0000e029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE029 16352 bytes
SHA-256: d8311a5dd9b6907948d554ae1ff067d65e652dd013df6b08db260e5d5b5a3f90
font_02_sfnt_off00010a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1